Naphthol dye and process of making same.



UNITED STATES PATENT UFFTQE.

CARLETON ELLIS, 0F MONTCLAIR, NEW JERSEY, ASSIGNOR T0 ELLIS-FOSTERCOMPANY.

A CORPORATION OF NEW JERSEY.

No Drawing.

To all whom it may concern:

Be it known that I, Cxnnn'rox ELLis', a citizen of the United States,and a resident of Montclair, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in UaphtholDye and Processes of lylaking Same, of which the following is aspecification.

This invention relates to dyestuffs made from naphthol, etc., bytreatment with alkali and sulfur or sulfur-containing alkaline materialand relates particularly to certain dark or black dyestuffs produced bythe heating preferably to a relatively high temperature a naphthol suchas beta naphthol with for example, sodium sultid, sulfur and water, thetemperature being raised gradually until a sort of fusion is obtained,all as will be made clear by the following illustrative procedure 20parts of beta naphthol were mixed with 30 parts of sulfur, parts ofsodium sulfid crystals and 100 parts of water, the proportion being byWeight. The mixture was heated for about five hours. During the firsthour the temperature was advanced to C. and it was maintained for theremaining four hours between 160-180 C. The fusion was dissolved inwater, acidified with dilute sulfuric acid and filtered. Theprecipitated dyestuff was dried and from a portion of this material adye bath was prepared by dissolving 5 parts by weight of the dye, 10parts of sodium sulfid, 15 parts each of sodium carbonate and sodiumchlorid and 200 parts of water. In very dilute solution the dye tingedthe water a greenish-blown.

When cotton material was treated with this Copiea ot'thls patent may beobtained for Specification of Letters Patent.

Application filed January 2, 1917.

Patented July 30, 1918.

Serial No. 140,116.

duce different shades or tones of color as may be desired. it beingunderstood that such formula is set forth for illustrative purposes andthat the reagents employed may be replaced by their equivalents withinthe scope of the present invention to such an extent as may be desiredand as will now be obvious to those skilled in the art.

Mixtures of naphthol with cresol or dinitrophenol. dinitrochlorbenzoland the like may be heated with alkaline sulfid to produce blacks. Forexample in the above formula one third of the naphthol may be replacedby crcsol or dinitrophenol.

The product obtained by this process in its preferred form is a sulfidednaphtholsoluble in an alkaline sultid solution and capable of dyeingcotton in such ath to a deep black color.

What 1 claim is 1. The process of making a coloring agentwhich compriscsheating naphthol, sulfur and alkali to a temperature of at least 160 C.

2. The process of making a coloring agent which comprises heatingnaphthol material, sulfur and alkali to a. temperature of at least 160(3., but not exceeding C.

3. The process of making a coloring matter which comprises fusing betanaphthol and dinitrophenol with sodium suifid and sulfur.

4. The process of making a coloring agent which com )rises heating betanaphthol, sulfur and a] ah to a temperature of at least 160 but notexceeding 180 C.

5. The process of making a black coloring matter which comprises heatingbeta naphthol with an alkaline sultid to about 1601S0 C. for about 5hours.

6. The process of making dark coloring matter which comprises heatingnaphthol with sodium sulfid and sulfur to a temperature of approximatelyUSO-180 C.

CARLETON ELLIS.

five cents each, by addressing the Commissioner of Patents, Washington,D. 0."

